Magnus Archery Stinger 4 Blade Broadhead - 3 PackAll Magnus Stingers perform flawlessly from the fastest bows on the planet with field tip accuracy. The quality of our construction is unmatched, but if you break one, we will replace it according to our Lifetime Guarantee. You can sharpen the main blades yourself, or replace them either way, the Stinger effectively fills every need for a solid hunting broadhead.(Stinger patent 7,160,217 & 7,597,637)